How Django keeps track of your model classes?

I have ran the python manage.py makemigrations command several hundreds of times. Recently I had a surge of curiousity to find out how does django detect changes and generate migration files for an app.

I needed many answers but one of the first question I had was "How does Django keep track of my model classes?"

In Django, the creation of model classes is fundamental to mapping your application's data model to a database. These model classes inherit from Django's …

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